TBH this is pretty shocking. I didn't have a clue about this and was thinking of getting a 4Gb due to preferring the matt colour.
I'm in exactly the same boat. You would have thought Microsoft would have the decency to warn us of the HDD requirements on certain games. It's highly misleading! I cannot imagine how many people are irritated right now at firing up Reach in giddy excitement only to be told they cannot play with their friends as they bought the 4GB Xbox - for which HDDs aren't even available yet!
Absolutely shocking. I thought the 4GB memory would cover in for any HDD requirements but it doesn't.
